> For the complete documentation index, see [llms.txt](https://docs.lorric.com/qr/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.lorric.com/qr/fu-es-echosense-instruction-manual/communication/modbus-rtu-protocol/read-only-memory-rom/read-only-memory-rom-list.md).

# Read-Only Memory (ROM) – List

## Memory Location and Definition

### How to use the tables on this page:

| **Field Names**  | **Functions**                                                             |
| ---------------- | ------------------------------------------------------------------------- |
| Register Address | The addresses for read/write memory are not shared with read-only memory. |
| Register Length  | The length of the variable, in units of Registers (2 bytes each).         |
| Memory Content   | Description of the function or purpose of the memory.                     |
| Data Type        | Specifies the format of the transmitted or received data.                 |

### Read-Only Memory List

| Register Address | Register Length | Memory Content                                                                                                                 | Data Type       | Remarks                                                                    |
| ---------------- | --------------- | ------------------------------------------------------------------------------------------------------------------------------ | --------------- | -------------------------------------------------------------------------- |
| 0000             | 2               | Instantaneous Flow                                                                                                             | float 32        |                                                                            |
| 0002             | 2               | Instantaneous Flow Rate                                                                                                        | float 32        |                                                                            |
| 0004             | 2               | Totalized Flow                                                                                                                 | float 32        |                                                                            |
| 0006             | 2               | Instantaneous Flow                                                                                                             | int 32          | Value is instantaneous flow ×100                                           |
| 0008             | 2               | Instantaneous Flow Rate                                                                                                        | int 32          | Value is instantaneous flow rate ×100                                      |
| 000A             | 2               | Totalized Flow                                                                                                                 | int 32          | Value is totalized flow ×100                                               |
| 000C             | 2               | Iout Current Value (μA)                                                                                                        | unsigned int 32 |                                                                            |
| 000E             | 1               | [error code a](/qr/fu-es-echosense-instruction-manual/user-interface/alarms-and-system-status.md#alarm-critical-failure)       | unsigned int 16 | First byte is 0, due to no definition.                                     |
| 000F             | 1               | [error code b](broken://pages/-LxsW1nT36ZZ4ZeSHIwI#alarm-b-out-of-specification)                                               | unsigned int 16 | First byte is 0, due to no definition.                                     |
| 0010             | 1               | [error code c](/qr/fu-es-echosense-instruction-manual/user-interface/alarms-and-system-status.md#alarm-c-maintenance-required) | unsigned int 16 | First byte is 0, due to no definition.                                     |
| 0011             | 1               | [error code d](/qr/fu-es-echosense-instruction-manual/user-interface/alarms-and-system-status.md#alarm-d-function-check)       | unsigned int 16 | First byte is 0, due to no definition.                                     |
| 0012             | 1               | [System Status](broken://pages/-LxsW1nT36ZZ4ZeSHIwI#system-status)                                                             | unsigned int 16 | First byte is 0, due to no definition.                                     |
| 0013             | 4               | Totalized Flow                                                                                                                 | int 64          | Value is totalized flow ×100,000, rounded to integer (introduced in P1203) |
| 0017             | 2               | Dosing                                                                                                                         | float32         | (introduced in P1203)                                                      |
| 0019             | 2               | Dosing                                                                                                                         | int32           | Value is totalized flow ×100, rounded to integer (introduced in P1203)     |
| 001B             | 4               | Dosing                                                                                                                         | int64           | Value is totalized flow ×100,000, rounded to integer (introduced in P1203) |


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://docs.lorric.com/qr/fu-es-echosense-instruction-manual/communication/modbus-rtu-protocol/read-only-memory-rom/read-only-memory-rom-list.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.